Introduction: Organizational citizenship behavior (OCB) and social capital constitute Organizational behavior, which have immense effect on performance and productivity. This study was conducted to analyze the relationship between social capital and (OCB) among employees at teaching hospitals in Hormozgan University of Medical Scinces.

Methods: This cross-sectional study was performed in 2011. Standardized questionnaires of Podsakoff and Nahapeit were used to gather data on OCB and social capital, respectively. The validity of questionnaires was approved and its reliability was measured by calculating Cronbach's alpha which was shown to be 0.72, 0.84, respectively. Sampling was done through classified random sampling method. Data analysis was performed using SPSS 19 software and to analyze the relationship between above mentioned variables ANOVA and Pearson tests were used.

Results: The mean value of organizational citizenship behavior and social capital were found to be 3.1±0.53 and 2.7±0.58, respectively. A statistically significant relationship between OCB and social capital was observed. In addition, There was significant relationship between demographic variables such as education, organizational position, shift work and gender with social capital and OCB (P<0.01).

Conclusion: Considering the importance of organizational citizenship behavior for Institutions, to improve efficiency it is suggested that administrators of hospitals and health care institutes adopt policies to enhance these two issues among staff.